[BUG][Crystal] Can not generate request form body parameters with additional properties

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

It seems like OAG can't generate below spec correctly.

I have tried below command line options:

• With minimal options

  • docker run --rm -it -v ${PWD}:/gen --user 1000:1000 --workdir /gen/ openapitools/openapi-generator-cli:latest generate --type-mappings=Object=JSON::Any,AnyType=JSON::Any,decimal=BigDecimal -g crystal -i example_api_specs/bug_spec.yml -o /gen/local/bug --additional-properties=shardName=bug,moduleName=Bug,shardLicense=MIT,shardVersion=0.0.1,shardAuthors=cyangle,skipOperationExample=true,shardDescription=Bug
    

  • It generated one api file fake_api.cr but there's no models generated
  • And the request body param inline_map is missing from fake_api.cr
  • api method: def fake(id : String?, map_of_string : Hash(String, String)?, map_of_pet : Hash(String, Pet)?)

• With --global-property skipFormModel=false

  • docker run --rm -it -v ${PWD}:/gen --user 1000:1000 --workdir /gen/ openapitools/openapi-generator-cli:latest generate  --global-property skipFormModel=false --type-mappings=Object=JSON::Any,AnyType=JSON::Any,decimal=BigDecimal -g crystal -i example_api_specs/bug_spec.yml -o /gen/local/bug --additional-properties=shardName=bug,moduleName=Bug,shardLicense=MIT,shardVersion=0.0.1,shardAuthors=cyangle,skipOperationExample=true,shardDescription=Bug
    

  • It generated 2 models: FakeRequest and Pet
  • FakeRequest has all request body properties
  • But the model FakeRequest is never used in the generated api file fake_api.cr
  • api method is like this: def fake(id : String?)

Maybe I'm missing some command line flags for this to work.

I found this problem while trying to improve support for form serialization in crystal generator.

@wing328

openapi-generator version

6.2.1-SNAPSHOT

OpenAPI declaration file content or url

bug_spec.yml

openapi: 3.0.0
info:
  description: >-
    This spec is mainly for testing Petstore server and contains fake endpoints,
    models. Please do not use this for any other purpose. Special characters: "
    \
  version: 1.0.0
  title: OpenAPI Petstore
  license:
    name: Apache-2.0
    url: "https://www.apache.org/licenses/LICENSE-2.0.html"
tags:
  - name: fake
paths:
  /fake:
    post:
      tags:
        - fake
      operationId: fake
      parameters:
        - name: id
          in: query
          schema:
            type: string
      requestBody:
        content:
          application/x-www-form-urlencoded:
            encoding:
              map_of_string:
                explode: true
                style: deepObject
              map_of_pets:
                explode: true
                style: deepObject
              inline_map:
                explode: true
                style: deepObject
            schema:
              type: object
              properties:
                map_of_string:
                  $ref: "#/components/schemas/map_of_string"
                map_of_pet:
                  $ref: "#/components/schemas/map_of_pet"
                inline_map:
                  type: object
                  additionalProperties:
                    type: string
      responses:
        "200":
          description: The instance started successfully
          content:
            application/json:
              schema:
                type: object
                additionalProperties: true
servers:
  - url: https://localhost:8080/{version}
    description: The local server
    variables:
      version:
        enum:
          - "v1"
          - "v2"
        default: "v2"
  - url: https://127.0.0.1/no_variable
    description: The local server without variables
components:
  schemas:
    map_of_string:
      type: object
      additionalProperties:
        type: string
    map_of_pet:
      type: object
      additionalProperties:
        $ref: "#/components/schemas/pet"
    pet:
      type: object
      properties:
        id:
          type: string
        name:
          type: string

Generation Details

See description.

Steps to reproduce

See description.

Related issues/PRs

Suggest a fix

Start with example_api_specs/bug_spec.yml and run the documented Crystal generator command to reproduce the missing inline_map request-body parameter. Inspect the Crystal generator path that handles application/x-www-form-urlencoded bodies and additionalProperties, then verify that generated fake_api.cr includes the inline_map input and that the generated FakeRequest behavior is consistent.